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From "Arijit (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13308) Hint files not being deleted on nodetool decommission
Date Wed, 08 Mar 2017 10:09:37 GMT
Arijit created CASSANDRA-13308:
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             Summary: Hint files not being deleted on nodetool decommission
                 Key: CASSANDRA-13308
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13308
             Project: Cassandra
          Issue Type: Bug
          Components: Streaming and Messaging
         Environment: Using Cassandra version 3.0.9
            Reporter: Arijit
            Priority: Minor


How to reproduce the issue I'm seeing:
Shut down Cassandra on one node of the cluster and wait until we accumulate a ton of hints.
Start Cassandra on the node and immediately run "nodetool decommission" on it.

The node streams its replicas and marks itself has DECOMMISSIONED, but other nodes do not
seem to see this message. "nodetool status" shows the decommissioned node in state "UL", and
Cassandra logs show that this is because gossip tasks on nodes are blocked. Jstack shows that
the tasks are blocked on hints dispatch (I can provide traces if this is not obvious). Because
the cluster is large and there are a lot of hints, this is taking a while. 

On inspecting "/var/lib/cassandra/hints" on the nodes, I see a bunch of hint files for the
decommissioned node. Documentation seems to suggest that these hints should be deleted during
"nodetool decommission".

When I manually delete hint files on the nodes, the hints dispatcher threads throw a bunch
of exceptions and the decommissioned node is now in state "DL" (perhaps it missed some gossip
messages?). The node is still in my "system.peers" table

Restarting Cassandra on all nodes after this step does not fix the issue (the node remains
in the peers table). In fact, after this point the decommissioned node is in state "DN"



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